Designing networks and subnetworks
A network in GCP is called a VPC, and it differs from the way other cloud platforms define virtual networks in that it is a more purely logical construct, with no IP address range defined in it. It is also global by default, spanning all available GCP regions, and it is segmented by subnetworks (the equivalent to what is referred to as subnets in other cloud platforms), which themselves have IP address ranges and a set region. A GCP project can have up to five VPC networks (although this quota can be increased upon request), and networks can be shared across projects and also peered with each other.
There are three network types (or "modes") in GCP, as follows:
- Default: Provided by default to every new project. It contains one subnetwork per region and includes some default firewall rules. These default rules allow all traffic within the network, as well as inbound RDP, SSH, and ICMP from any other network.
- Auto: Auto mode...
